The following is a guide to major free resources available online. The guide was prepared by Alexandra Janvey and published in College & Research Libraries News Journal, a publication of the Association of College & Research Libraries, July/August 2013 (vol.74, no.7, pp. 370-373.)
MUSIC THEORY
Music Theory and History Online
ORGANIZATIONS
American Federation of Musicians (AFM)
American Musicological Society (AMS)
Association for Recorded Sound Collections (ARSC)
New World Symphony : The John Cage Video Archive
SEARCH ENGINES
SCORES and SHEET MUSIC
e-codices: Virtual Manuscript Library of Switzerland
Music for the Nation: American Sheet Music
SOUND RECORDINGS
American Memory from the Library of Congress
Belfer Cylinders Digital Connection